Drag the green start point and the red end point to control the trajectory.

Click on New to select a tiling.

Click on View to zoom in or out, or to reset the view to focus in on the central polygon.

ARROW KEYS to move the camera.

WASD move the end point.

SHIFT+WASD move the end point and the start point simultaneously.

I,O,R to zoom in, zoom out, and reset zoom, respectively.

CTRL+[click & drag] to draw a box to zoom in.

ESC to close this help.